Tunisian protesters shout slogans during a demonstration called by supporters of the radical Islamist party Hizb ut-Tahrir to denounce a draft constitution that they consider to be too secular. (FETHI BELAID / AFP/GETTY IMAGES)

Riot police officers gather in the center of Kiev. Ukrainian police stormed protesters’ barricades as violent clashes erupted leaving three protesters dead, two of them from gunshot wounds.The move by police increased tensions to a new peak after two months of protests over President Viktor Yanukovych’s failure to sign a deal for closer ties with the EU. (Anatolii Boiko / AFP – Getty Images)

A protester aims fireworks at police during clashes, in central Kiev, Ukraine. Thick black smoke from burning tires engulfed parts of downtown Kiev as an ultimatum issued by the opposition to the president to call early elections or face street rage was set to expire with no sign of a compromise on Thursday. (Efrem Lukatsky/AP)

Demonstrators destroy a bank to protest the upcoming World Cup soccer tournament and demand better public services in Sao Paulo, Brazil. Last year, millions of people took to the streets across Brazil complaining of higher bus fares, poor public services and corruption while the country spends billions on the World Cup, which is scheduled to start in June. (Nelson Antoine/AP)

This aerial image made from an Egyptian army helicopter shows a general view of a pro-military rally marking the third anniversary of the uprising that toppled autocrat Hosni Mubarak in Tahrir Square in Cairo, Egypt, Saturday, Jan. 25, 2014. Egyptian riot police have fired tear gas to disperse hundreds of supporters of ousted Islamist President Mohammed Morsi protesting as the country marks the third anniversary of the 2011 uprising, as supporters of the military gathered in rival rallies in other parts of the capital, many of them urging military chief Gen. Abdel-Fattah el-Sissi, the man who removed Morsi, to run for president.(Hassan Ammar/AP)

Fireworks explode over Darling Harbour during Australia Day celebrations in Sydney. (Rob Griffith/AP)

A pedestrian walks along the banks of the Neris river in Vilnius, Lithuania, as temperatures dipped substantially below freezing. (MINDAUGAS KULBIS / AP)

A dove which was freed by children flanked by Pope Francis during the Angelus prayer, is chased by a black crow in St. Peter’s Square, at the Vatican. Symbols of peace have come under attack at the Vatican. Two white doves were sent fluttering into the air as a peace gesture by Italian children flanking Pope Francis Sunday at an open studio window of the Apostolic Palace, as tens of thousands of people watched in St. Peter’s Square below. After the pope and the two children left the windows, a seagull and a big black crow quickly swept down, attacking the doves, including one which had briefly perched on a windowsill on a lower floor. One dove lost some feathers as it broke free of the gull, while the crow pecked repeatedly at the other dove. The doves’ fate was not immediately known. While speaking at the window, Francis appealed for peace to prevail in Ukraine. (Gregorio Borgia/AP)

A homeless man naps in front of a mural painted by artist Ruben Soto in Los Angeles. The county’s homeless population has increased 15 percent from 2011 to 2013, according to a recent report released by the Los Angeles Homeless Services Authority. (Jae C. Hong / AP)

Sjinkie Knegt of the Netherlands’ team makes an obscene gesture towards Victor An, left, of the Russian team who was celebrating after Russia won the men’s 5000m relay final race of the ISU European Short Track speed skating Championships in Dresden, Germany. Russia won the race ahead of the Netherlands in second place and Germany. (Robert Michael / AFP – Getty Images)

A Central African police officer guards a suspect arrested after members of a Christian militia looted houses and shops belonging to Muslims in the capital of Bangui. The Central African Republic’s new interim president, Catherine Samba Panza, was sworn in Thursday and is tasked with ending horrific sectarian violence. (ISSOUF SANOGO / AFP/GETTY IMAGES)

An Egyptian firefighter checks a crater created by a blast at the Egyptian police headquarters in downtown Cairo. Three bombings hit high-profile areas around the capital on Friday, including a suicide car bomber who struck the city’s police headquarters, killing several people. The bombings were the first major attack on Cairo as insurgents step up a campaign of violence after the ouster of Islamist President Mohamed Morsi. (AMR NABIL / AP)